LCM is the multiple of the highest power of prime factors in two or more numbers. Example: LCM of 9, 15, and 25 is 225, which is the multiple of the highest power of prime factors in 9, 15, and 25 (32 x 52).
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Since they are relatively prime, (their GCF is 1) the LCM is their product.
The LCM is 275 and the GCF is 55
The GCF and LCM of 10 and 10 is 10.
The GCF is b.
You have to multiply the two numbes together to get the LCM.